Micrometer gauge



July 31, '1923.

C. A. CLASE MICROMETER GAUGE Patented duly 3l, i923.,

entran sTnTas CHARLES A. CLASE, OF PORTLAND, OREG-N'.

MICROMETER GAUGE.

Application led September 20, 192i. Serial No. 501,969.

To all whom it may concem:

Be it known that l, CHARLES A. CLASE, a citizen of the United States,and a resident of Portland, county of Multnomah, and State oilv Oregon,have invented a certain vnew and- `eadings taken, from an outsideposition, and

more quickly and simply than heretofore.

Among the specific features provided in my micrometer gauge are thefollowing: There are no threads exposed; only two mitre gears arerequired; the device has only few wearing parts; the bearing surfacesare of considerable length thereby retaining ac curacyl; the operatingparts are enclosed against dust and dirt.

The above objects are attained by the novel features of Construction,combination and arrangements of parts fully shown in the accompanyingdrawings, in which:

Fig. l is an elevation or" my micrometer ewes;

l? ig. 2 is a larger scaled cross section of one end of the gauge;

Fig. 3 is a similar view or the other end of the gauge;

Fig. is an end elevation of that portion of the gauge shown in Fig, 2;

Fig. is a plan view of the parts shown in Fig. 3; i

F'gs. 6, 7 and 8 are perspective views of certain of the parts used inthe measuring head assembly;

9 is a horizontal section taken on the line 9 9 of Fig. 2;

Fig. l0 is a right end elevation of the parts shown in Fig. ll is a sideelevation of the ratchet;

Fig. l2 is an end elevation of the same.

Referring to these drawings, the detailed construction of my improvedmicrometer is substantially as follows:

ci represents measuring head having an integral, perpendicular, arm b,the latter made a threaded end c. The head a is made in the form of ahousing adapted to hold contact points out the gauge, and

-intermediate guide plate e.

to this end is provided with a cover a? and an Screws hold these partsin proper related position. The plate e is made with a slot g, and atubular member z. is positioned centrally in the head a, being heldagainst rotation by a lug z' bearing in the slot g. Said tubular memberit is however, capable of longitudinal moven ment in the bore of thehead a. A contact point member y' is made in the shape of a pin adaptedto lit the upper end of the tubular member and is locked in position bya set screw ic.

The lower end of the member Il is threaded internally, and a screw Zworks in said threaded portion. As said screw turns, the tubular memberit, carrying the contact point j will move longitudinally in the head.-

ln the opposite end of the head a is threaded a stationary contact pointm which is locked by a set screw n. This contact point provides `abearing for the lower end of the screw Z. A bevel gear o is fixed onthis end of the screw and forms one member of a transmission mechanism,the supplementary parts of which will be detailed hereafter.

rl'hreaded on the arm is a barrel 11. Said barrel is locked againstrotation by a knurled nutg. The barrel is further provided with alongitudinal slot r. A sleeve s is made with a sliding 5t on the barrelp and the beveled end z? or said sleeve is adapted vto cooperate withcertain graduations on the outside ot' the barrel. A nut u is adapted toslide in the barrel p and is rigidly secured to the sleeve s by screwso. A liller piece w the width and thickness of the slot r per mitsconvenient assembly of these parts. lt will thus be seen that the sleeves can move longitudinally on the barrel p, but is held from rotarymovement by the liller piece w.

rllhe nut lu is threaded internally, and a screw :u is adapted to workin said thread. rlhis .screw has a bearing at one endin the hollow boredarm Z5, and on its forward end is fixed a bevel gear y, engaging withand adapted to drive the gear o. lt is obvious that as the screw a2 isturned, the contact point j will move accordingly, and the sleeve s willslide on the barrel p and register the relative movement ot the saidContact point, by means 1 ot predetermined graduations. Lock nuts 5 onthe inner end 'of the screw prevent end movement of the latter.

as a means for turning the screw a2, provide the lrollcfwirg: A lmnrledthimble lill .e is adapted to [it the end of the barrel p. Said thimbleis made with a graduated beveled edge 2, adapted to register with anindex line on the barrel so as to indicate degrees of rotary movement ofthe screw. This thimble is threaded internally, and a screw plug 3 fitsin said threaded portion. The plug is bored out so as to provide a seatfor the outer end of the screw the latter being locked securely inposition by the set screw 4. 0n the outer end of the .plug 3 isrotatably mounted a knurled ratchet 6, which is held in place by screw 7and controlled by' the spring and pin numbered 8.

My device operates as follows:

Coarse adjustment of the contact oints maybe made by turning the thim lea. vWhen the micrometer has been set approximatel correct the operatorrotates the barrel p by grasping the ratchet 6 and continuing therotation. The barrel will continue to rotate until the points contactagainst the parts being measured. The ratchet 6 will then slip inrelation to the screw plug 3 because the spring inv pin 8 will pass overthe toothed face of theratchet and prevent further rotation.

llt is obvious that longer contact pins may be used so as to increasethe range of application of the gauge.

rlhe lower part of both the removable side of the measuring-head and ofthe guide plate are cut out as shown at 9 and 10 in Figs. 6 and 7,respectively, so as to accommodate the mitre .gear o.

I claim:

1. lin a micrometer gauge, the combination of an elongated hollow handleprovided with a hollow measuring head; perpendicular to said handlel andrigidly secured thereto, said handle being provided with a slot,extending longitudinally thereof, a screw journaled in the handle andhaving one end of the screw extending into said measuring head and theopposite end extending beyond the handle, a nut mounted on the screwwithin the hollow handle and having a lug adapted to ride said slot, asleeve mounted 'on the handle and connectcd with said nut thru saidslot, the exterior of the handle being calibrated, means on that end ofthe screw projecting without the handle for rotating the screw, a mitregear mounted on that end of the screw extending into said head, a secondmitre gear journalled in said head on an axis normal to that of thescrew in the handle, said second gear meshing with the first mentionedgear, a screw carried by the second mitre gear and extendinglongitudinally of said head, a tubular member threaded on the latterscrew and being adapted Jfor longitudinal movement in the measuringhead, said head being provided at one end with a removable Contactpoint, and a second contact vpoint removabl carried b said` tubularmember at the ot er end o said 2. The combination set forth in claim ldistinguished in that the measuring head is vprovided with a slottedguide-plate and the tubular member has a lug, bearing in said guideplate, to hold the tubular member against rotation.

3. lin a micrometer gauge the combination of a hollow handle providedwith a hollow measurin -head, secured perpendicularly to said han le, ascrew journalled in the handle and having one end extending into saidmeasuring head, a nut mounted on said screw and held against rotationtherewith, an indicating sleeve mounted on the handle and connected withsaid nut, a mitre gear .mounted on that end of the screw, extending intosaid head, a second mitre gear journalled in said head on an axis normalto that of the screw in the handle and meshing with first mentionedmitre gear, a member car-- ried by the second mitre gear, a memberadapted for longitudinal movement in the measuring-head by the rotationof said member, carried b the second mitre gear, means holding sailongitudinally movable member against rotation, said head provided atone end with a Contact oint, a second contact point carried by said)longitudinally movable member in the other end of said head.y

4. In a micrometer gauge the combination of a hollow handle providedwith a hollow measuring-head secured perpendicularly to said handle, ascrew journalled in the handle and having one end extending into saidmeasurin head, a nut mounted on said screw an held against rotationtherewith, an indicati-ng sleeve mounted on the handle and connectedwith said nut, a mitre gear mounted yon that end of the screw extendinginto said head, a second mitre gear jourv nalled in said head on an axisnormal to that of the screw in the handle and meshing with firstmentioned mitre gear, a member carried by the second mitre gear, amember adapted for longitudinal movement in the measuring-head by therotation of said meinber carried by the second mitre ear, said headbeing provided at one end wlth a contact point, a second contact pointcarried by said longitudinally movable member in the other end of saidhead the measuring head being made with a removable side, and a slottedguide plate, and the longitudinally movable member being provided with alug bearing in said guide plate.

5. In a micrometer gauge the combination of, a handle provided with ameasuring head perpendicular to said handle and rigidly secured thereto,a micrometer screw carried by said handle, a second micrometer screwextending longitudinally o said head, means ian fortransmitting therotary motion of said first mentioned screw to said second mentionedscrew, a sleeve threaded on the latter screw, such sleeve carrying acontact point, and means for holding the sleeve against rotating.

6. In a micrometer gauge the combination of, a handle provided with ameasuring head perpendicular to said handle, a micrometer screw carriedby said handle, a second micrometer screw extending longitudinally ofsaid head, means for transmitting tlfe rotary motion of said firstmentioned screw to said second mentioned screw, a sleeve threaded on thelatter screw, such sleeve carrying a contact point, a slotted plate eX-tending longitudinally of said. measuring head, one side of themeasuring head being removable to receive said plate and said sleevehaving a lug bearing in the slot of said plate.

' CHARLES A. CLASE.

